Slider unable to create settings for breakpoints

When I add a slider to a page I am unable to alter image size for a specific break point.

For instance I add in slider and then add the full size slider image in.

I then go to responsive mode and go to mobile. If I now re-size the image to be viewable on the mobile phone, it re-sizes it for all breakpoints. So when I go back to desktop the image is now small as its same size thats been set on mobile.

How do I set up the image sizes for the break points? Most sliders will scale the image but this one cuts off all the surrounding image and looks horrible on mobile.

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